Transcriptome profiling reveals infection strategy of an insect maculavirus.

Transcriptome profiling reveals infection strategy of an insect maculavirus.
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DOI:
10.1093/dnares/dsx056
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发表时间:
2018-01-17
期刊:
DNA research : an international journal for rapid publication of reports on genes and genomes
影响因子:
--
通讯作者:
Iwanaga M
Iwanaga M
中科院分区:
其他
文献类型:
--
作者:
Katsuma S;Kawamoto M;Shoji K;Aizawa T;Kiuchi T;Izumi N;Ogawa M;Mashiko T;Kawasaki H;Sugano S;Tomari Y;Suzuki Y;Iwanaga M

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家蚕斑状病毒(BmMLV)是一种阳性单链昆虫RNA病毒,与植物斑状病毒密切相关。 BmMLV 目前被定性为一种未分类的黄斑病毒。 BmMLV 在蚕(Bombyx mori)来源的细胞系中积聚水平极高,但它不会导致致命性并造成持续感染。目前尚不清楚这种昆虫黄斑病毒如何在昆虫细胞中复制并建立持续感染。在这里,我们发现 BmMLV p15 位于亚基因组片段上,在植物斑病毒中不存在,但在 BmMLV 感染的蚕细胞中高表达,并且 p15 蛋白是在蚕细胞中建立 BmMLV 感染所必需的。我们还表明,两种不同的小 RNA 介导的途径可维持 BmMLV 感染的蚕细胞中的 BmMLV 水平,从而使病毒建立持续感染。随着感染的进展,病毒衍生的 siRNA 和 piRNA 都会产生。敲低实验表明,单独的外源RNAi途径或RNAi和piRNA途径协同作用可沉默BmMLV RNA,并且这两种途径对于BmMLV感染的蚕细胞的正常生长都很重要。在我们研究的基础上,我们提出了一种类似植物病毒的昆虫病毒如何在昆虫细胞中建立持续感染的机制。
Bombyx mori macula-like virus (BmMLV) is a positive, single-stranded insect RNA virus that is closely related to plant maculaviruses. BmMLV is currently characterized as an unclassified maculavirus. BmMLV accumulates at extremely high levels in cell lines derived from the silkworm, Bombyx mori, but it does not lead to lethality and establishes persistent infections. It is unknown how this insect maculavirus replicates and establishes persistent infections in insect cells. Here, we showed that BmMLV p15, which is located on a subgenomic fragment and is not found in plant maculaviruses, is highly expressed in BmMLV-infected silkworm cells and that p15 protein is required to establish BmMLV infections in silkworm cells. We also showed that two distinct small RNA-mediated pathways maintain BmMLV levels in BmMLV-infected silkworm cells, thereby allowing the virus to establish persistent infection. Virus-derived siRNAs and piRNAs were both produced as the infection progressed. Knockdown experiments demonstrated that the exogenous RNAi pathway alone or RNAi and piRNA pathways function cooperatively to silence BmMLV RNA and that both pathways are important for normal growth of BmMLV-infected silkworm cells. On the basis of our study, we propose a mechanism of how a plant virus-like insect virus can establish persistent infections in insect cells.
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